Circuit-controlling device.



G. O. GRAVES.

CIRCUIT CONTROLLING DEVICE.

APPLICATION IILED MAR. 27, 1913.

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UNITED STATES PATENT OFFICE.

CHARLES C. GRAVES, 0F NEWARK, NEW JERSEY, ASSIGNOR T0 WESTERN ELECTRIC COMPANY, OF NEW YORK, N. Y., A CORPGRATION OF ILLINOIS.

CIRCUIT-CONTROLLING DEVICE.

Application filed March 27, 1913.

To all whom it may concern Be it known that I, CHARLES CLINTON GRAVES, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Circuit-Controlling Devices, of which the following is a full, clear, concise, and exact de scription.

This invention relates to circuit controlling devices, and particularly to an electromagnetic relay, and has for its object the production of a relay of few and simple parts, which is particularly sensitive to small currents.

The features of this invention are an improved magnetic circuit, improved means for providing for the ready adjustment of the contacts, the means for providing for the ready removal and replacement of the parts of the relay and other details of structure and combination of parts as will hereinafter more clearly appear.

This invention is illustrated in the acc0mpanying drawing in which the same reference characters are used throughout to designate the same parts, and in which- Figure 1 is a side elevation of the relay, with a sectional view of the cover thereof; Fig. 2 is an end elevation of the relay with a sectional view of the cover thereof on the lines 22; Fig. 3 is an elevation of the side of the armature and contacts and supports therefor opposite to that shown on Fig. 1: and Fig. 4 is a detail perspective view of various parts of the relay before assembly.

As shown in the drawings, the relay comprises a U-shaped core 5 made up of laminations 6 with magnet spools 7 mounted thereon. Secured to the closed end of the U- shaped core 5 is a bracket'8 with threaded lugs 9 welded thereto. These lugs 9 extend through apertures in an insulating plate 10 to which are attached the latch springs 12 (one not shown) for holding relay cover 11 in place, and an insulator 13 against which the open end of the relay cover 11 rests when in place. The free ends of the U-shaped core 5 extend through apertures in an insulating plate 14 and are secured to a yoke 15 of non-magnetic material by means of screws 16 and 17. Engaging the yoke 15 is an adjustable screw 18, the inner end of which bears against insulating plate 14 and Specification of Letters Patent.

Patented June 16, 1914.

Serial No. 757,159.

maintains the magnet spools 7 in a definite longitudinal position on the core 5. Mounted on but insulated from the yoke 15 by bushings 20 and 21 is a bracket 22 in which there is formed a socket 523 provided with an internal threaded portion to receive the threaded stud 24 carrying front contact 25. In the insulating plate 14 there is a recess 26 into which the inner end of the stud 24 extends so as to permit of the proper adjustment of the contact 25.

Secured to the yoke 15 and adjacent to one of the free ends of the core 5 is an armature mounting lug 35 to which is attached, by means of a flexible magnetic strip 36, an armature 37 carrying contact anvils 38 and 39. The upper portion of the flexible magnetic strip 36 is riveted to the armature 37, and the lower portion, in which is formed a tongue 40, is riveted to the armature mounting lug 35, with the tongue portion free. Engaging the armature mounting lug 35, is an adjusting screw 45, the inner end of which bears against the tongue 40, and by means of which the tension of the tongue 40 may be varied and the proper adjustment of the armature 37 obtained. The use of the flexible magnetic strip 36, in addition to avoiding the necessity of using other auxiliary tensioning means for the armature 35, furnishes a path of low reluctance for the magnetic flux.

Mounted on the yoke 15, adjacent to but insulated from the armature mounting lug 35 by bushing 46, is a back contact support 47. Screws 48, 48 secure the armature mounting lug 35, bushing 46' and back contact support 47 to the yoke 15. The outer end of the adjusting screw 45 extends through an aperture in the bushing 46 and the back contact support 47 so as to permit of the ready adjustment of the armature 37. Engaging the back contact support 47 is an adjusting screw 50, which carries on its inner end back contact 41.

Extending through an aperture in the insulator 13 and insulating plates 10 and 14 are terminals and 56, which are removably connected to the bracket 22 and the back contact support 47 respectively.

, Under normal conditions, screw 45 is adjusted so that contact anvil 38 engages with back contact 41. Upon the energization of the windings on the core 5, armature 37 is attracted by one of the free ends of the core 5 breaking contact 38, ll and making contact '25, 39.

This invention, among other things, makes possible the ready replacement of parts and in such a manner as to avoid the usual large amount of adjusting necessary to bring the relay into normal condition after the replacement of any parts.

It will be readily apparent that, with the relay assembled as above described, adjusting screw 18, armature mounting lug 35, armature 37, flexible magnetic strip 36, bushing 46, back contact support 47 or terminal 56 may be very readily removed and replaced by merely removing screws 4:8, 48; magnet spool 7 or both of them, or insulating plate 14, may be readily removed and replaced by merely removing screws 16 and 19; bushing 20, bushing 21, bracket 22 or stud 2-11; may be readily removed and replaced by merely removing screws 16 and 1 This device is particularly adapted for use in cord circuits in connection with long toll lines, and is responsive to alternating currents of low frequencies or to direct current. Furthermore, by reason of the laminated core structure, the impedance of the device is such that no extra impedance or retardation coils are required in the line with which it is connected, in order to prevent transmission losses. This has two advantages, first, it saves the cost of the extra impedance or retardation coils heretofore provided in circuits, in which this device is to be used, and second, it responds more readily to the signaling currents than would a device having impedance coils connected in the circuit therewith.

I claim:

1. A circuit closing device comprising a U-shaped core, energizing windings therefor,

a mounting lug secured to one free end of said core, an armature, a flexible magnetic strip securing said armature to said mounting lug in position to be attracted to the other free end of said core, an adjusting screw carried by said mounting lug and engaging said flexible magnetic st-rip, and contacts controlled by said armature.

2. A circuit closing device comprising a L -shaped core, energizing windings there for, a yoke removably attached to the open end of said core, a mounting lug removably attached to said yoke and in juxtaposition to one free end of said core, an armature, a flexible magnetic strip securing said arma ture to said mounting lug in position to be attracted to the other free end of said core, an adjusting screw carried by said mounting lug and engaging said flexible magnetic strip, a bracket, having an internally threaded socket formed tiiereon, re movably mounted upon said yoke, a contact stud adjustably engaging said socket, a contact support removably mounted upon said yoke, and contacts controlled by said armature.

3. In a circuit closing device, a core, an energizing winding therefor, a mounting lug, an armature, a flexible strip securing said armature to said mounting lug, a contact support having an aperture therein, and an adjusting screw for said flexible strip extending through said aperture and said mounting lug and into engagement with said flexible strip.

In witness whereof, I hereunto subscribe my name this 2 lth day of March A. D., 1913.

CHARLES C. GRAVE S.

Witnesses:

Roy O. Horcoon, lVALTnR F. HOFFMAN.

Copies 0! this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

